Drill



J. J. FARRELL.

DRILL.

APPLICATION FILED JUNE 10. 1919.

1,331,189. Patented Feb. 17,1920.

WITNESSES MENTOR Q/ M I WWI J M fi/PPLQA A TTORNEYS UNITED STATES PATENTOFFICE.

JAMES JOSEPH FARRELL, OF ST. LOUIS, MISSOURI.

DRILL.

from storage battery posts.

The particular object of the invention is to provide a drill or toolwhereby the connector may be cut from around the post, thereby leavingthe post undisturbed. In common practice the post is drilled or boredaway in order to get the connector off. By the use of my invention theconnector can be taken off without boring or drilling the post away.

A further object of the invention is to provide an improved drill of theclass described which will be extremely simple, durable, efiicient inoperation and inexpensive to manufacture.

' With these and other objects in view which will become apparent as thedescription proceeds, the invention resides in the construction,combination and arrangement of parts hereinafter more fully describedand claimed, and illustrated in the accompanying drawing in which likecharacters of refer' ence indicate like parts throughout the severalfigures of which:

Figure 1 represents a view in elevation of a drill constructed accordingto my invention.

Fig. 2 represents a similar view partially in section, the section beingtaken at right angles to Fig. 1.

Fig. 3 represents a view in perspective of thelportion of the drillforming the counter sln i.

Fig. 4: represents the member forming the drill proper,arrangedpartially in section, representing the manner of operation.

The invention contemplates the use of a tool comprising in general acounter sink which initiates a-circular groove in thecon nector aroundthe post of the battery, and a drill which finishes the circular cut andthereby disconnects the connector from the post in order to allow theconnector to be removed.

The arrangement is such that the slots provided in the drill properserve the double Specification of Letters Patent.

Application filed June 10, 1919. Serial No. 303,044.

purpose of allowing egress of the material as it is cut, and of servingas a drive means for the lugs carried by the shank of the counter sink.

Referring more particularly to the drawing, the drill pro-per isindicated generally at A, and the counter sink at B. The drill includesa shank 1 reduced at its upper end, adapted to fit any suitable brace orother driving device, and a bit or tool which is carried by the shank.This bit is in the form of a hollow cylinder provided at diametricallyopposed points with slots 3 extending upward from the lower edge of thebit. At its lower edge the bit is provided with two diametricallyopposed cutting teeth 4, formed by oppositely inclining the lowersemicircular edges of the bit. It will be noted that each of the teeth 4occurs at the lower end of one of the slots 3. lVhen the bit is inoperation the metal or material cut by the teeth 4:, may find egressfrom the out or groove being made by passing out through the slot 3.

,.These slots are slightly curved, and are adapted to receive theopposite lugs 5 formed on the shank 6 of the counter shank. The shank isadapted to fit into the hollow cylindrical bit, and when in place theupper end of the shank abuts against the internal shoulder 7 at the baseof the bit, thus limiting the movement of the shank into the bit at sucha point that the teeth of the bit will be spaced from the head 8 of thecounter sink. There will therefore be no danger of damaging the teeth ofthe bit.

The. head 8 is provided with a circular series of cutting teeth 9, andcarries a cylindrical spring-pressed punch 10 which pro jeets below theteeth 9. The punch is connected to the lower end of a spring 11,arranged in a central bore in the counter-sink. The spring normallyholds the punch slightly beyond the cutting edges of the teeth 9, asindicated in Fig. 2.

drill is placed upon the post of the battery I with the central punchresting on the central point of the post.

I By then rotating the drill the teeth 9 of the counter sink Will cut acircular groove or channel in the connector around the post. This grooveor counter sink having been formed, the drill may be lifted, the countersink B allowed to drop out of the cylindrical bit, and the bit may thenbe fitted into the counter sink and the drilling process completed.During the operation of the counter sink in cutting a circular groove orchannel in the connectors the spring 11 keeps the central punch pressedon to the work.

In this way I am enabled toremove the connector from the post withoutdamaging the latter. The operation is a simple and speedy one, and ittakes a comparatively short time to complete when compared With the oldprocess of boringand drilling the post away. Furthermore, it saves thedam- 1 age incident to the drilling away of the post itself in order toget the connector ofi'.

Although I have described the preferred embodiment of my invention, Imay desire to make such changesin the construction,

combination and arrangement of parts thereof, as do not depart from thespirit of the invention and the scope of the appended claims. I

bit as to tend to retain the lugs in the slots.

2. In a drill of the class described, the combination of a hollowcylindrical bit pro vided with longitudinally extending slots, a countersink having a shank slidable into 7 the cylindrical bit and providedwith lugs engageable into said s1ots. Y

3. In a drill of the class described, the combination of a hollow bithaving an internal shoulder at its inner end and having teeth at itsouter end, a counter sink having a shank slidable into the hollow bitand adapted to rest against said shoulder and thereby limit the movementof the shank into the bit at such a point as to space the teeth of thebit fromthe head of the counter sink, substantially as described.

JAMES JOSEPH FARRELL. Witnesses:

FRED J .-MILLER, THOMAS I. GLANNON.

